philber
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I did some comparison tests between my NEX 7 and 5N, but flubbed the settings, so that the cams were not set the same. Arrrrgh!  I could of course correct for that, but it wouldn't be SOOC, which I would prefer so that no doubts can creep in.
Regarding the WATE, I compared it to ZM 18 on my 5N, so that there need be no Cornerfix, which might always induce a difference. The ZM "looks" generally sharper and contrastier, xhich is not surprising in a Zeiss Vs Leica comparison. The WATE offers more delicate and generally nicer colours, which again is in line with expectations.
Now, regarding the corner issue with NEX 7/NEX 5N/ NEX 5, I agree that magenta cast appears before corner softness/blur.
The WATE has no issues on NEX 7 IMHO. Yes, the corners are a bit softer than the centre wide open, but that is the case with most lenses, and this softness is just that, not any form of blur.
The ZM 18 is as sharp in the corners as in the centre, but displays magenta edges. This is easily fixed in Cornerfix, and shows that the edges are still fully "zeiss-esque".
Where I have matters I don't understand is with ZM 25 and ZM 35 f:2.0. I tried the ZM 25 on my NEX 5N, and found it to display mushy edges, let alone corners, even when stopped down to my usual f:5.6. Thus I didn't bother trying it on my NEX 7, where it could only be worse. Yet Jim Buchanan, whom I trust, shows pics with no issues beyond a Cornerfix....
Similarly, a blogger posted pics with a ZM 35 f:2.0 that were seriously mushy in the corners. I now own this lens, and have tried hard to replicate this issue, and have found none. No corner issues wide openn Frankly that was good news, because even my old 5 was clean in all cases with a 35m lens.
My guess is that, while magenta casts apprear before smear "in most cases", there are type pf shots where magenta casts may not appear at all, though they "ought to" if it is a strict lens-to-cam compatibility issue. Thus, aperture and range of the shot, as well as the colours in the picture seem to play a part. For example, what I sue as a test for magenta is shooting into a blue sky. But I can shoot a wall the next minute and not necessarily see the magenta.
The same is true with the smear. It may not appear at all distances and apertures.
Yes, I know, far from clarifying matters, this throws more variables into doubt...
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